1. D. Korchinski, Solution of a Riemann problem for a 2×2 system of conservation laws possessing no classical weak solution, thesis, Adelphi University, 1977.
2. A viscosity approximation to a system of conservation laws with no classical Riemann solution;Keyfitz,1989
3. Spaces of weighted measures for conservation laws with singular shock solutions;Keyfitz;J. Differential Equations,1995
4. An Existence and Uniqueness Result for Two Nonstrictly Hyperbolic Systems, vol. 219;LeFloch,1990
5. A Riemann problem whose viscosity solution contain δ-measures;Joseph;Asymptot. Anal.,1993